In
hot climates, drill 8 to 10, 1/2" holes in the
front of the box approximately 5" up from the
bottom. Vent holes may not be necessary in cooler
climates.

Attach
a 1 x 4 board to the top as a roof (recommended).

Attach
a 1 x 4 board in back of the box at the top in between
the two furring strips to create a chamber.

Two
bat boxes can be placed back-to-back and mounted on
a pole. Build two houses the same size. Drill 4 -
3/4" holes on the back of each to permit movement
of bats between the houses. The holes should be about
10" from the bottom edge of the back piece.